Plant Pathology - Study Mode
[#196] The smut of pearlmillet (caused by Tolyposporium penicillariae) is a
Correct Answer
(C) Soil borne
Explanation
Solution: The smut of pearl millet (caused by Tolyposporium penicillariae) is soil-borne. Smut of pearl millet (Pennisetum glaucum), caused by Tolyposporium penicillariae, is an important and widespread disease. It causes direct loss of grain by replacing them with smut sori, and yield losses of up to 30% have been reported. Soil-borne plant pathogenic fungi cause a variety of diseases, such as root rot, stem rot, crown rot, damping-off, and vascular wilts, resulting in significant economic losses in the yield and quality of agricultural and horticultural crops worldwide.
[#197] When disease spreads to the whole of plants, it is termed as
Correct Answer
(B) Systemic
Explanation
Solution: When a disease spreads to the whole of plants, it is termed Systemic. Systemic symptoms are those involving the reaction of a greater part or all of the plant, such as wilting, yellowing and dwarfing. In this, the pathogen spreads throughout the plant body and is associated with almost every stage of the plant's life cycle.
[#198] Enzymes occur in the cell in the form of
Correct Answer
(B) Colloids
Explanation
Solution: Enzymes occur in the cell in the form of Colloids. Cells contain thousands of different enzymes, and their activities determine which of the many possible chemical reactions take place within the cell. The colloidal state is a particulate phase, in which the particles range in. size from 1.0 nm to 10' nm, dispersed in a continuous phase, the dispersion medium.
[#199] One of the most resistant biological material is
Correct Answer
(D) Sporopollenin
Explanation
Solution: One of the most resistant biological materials is Sporopollenin. Sporopollenin is a ubiquitous and extremely chemically inert biopolymer that constitutes the outer wall of all land-plant spores and pollen grains. It is a highly cross-linked polymer composed of carbon, hydrogen, and oxygen that is extraordinarily stable. It is formed from the polymerization of carotenoids, is chemically very stable, and is resistant to almost all kinds of environmental damage.
[#200] Respiration can occur in the absence of oxygen in
Correct Answer
(C) Yeast
Explanation
Solution: Respiration can occur in the absence of oxygen in Yeast. Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. Yeasts are aerobic and facultatively anaerobic. Some yeasts are extremely aerobic and oxidative in their metabolism.